On Mon, Jul 7, 2008 at 5:16 PM, <[EMAIL PROTECTED]> wrote:
...
> You would have thought that a 1.2 compiler would be able to compile all
> earlier version of the language but they decided to implement it such you
> must tell the compile your using 1.2 of the language.
the rationale is that the shader author must declare their intent to
use newer/extended features of the language, to enhance portability of
shader code across different GLSL implementations.
> Also, about the CPP part of my question, I see the shader language supports
> many of these directives.. Is there any way to externally (i.e. in OSG) to
> set a "#define" variable?? For example, With the CPP, I use "cpp
> -DVariable=10 infile.txt outfile.txt". And then I'd do a:
> fragProgram->loadShaderSourceFromFile("outfile.txt");
> Do I have to create a "#define Variable 10" string and prepend it to my
> shader code (which isn't easy if I use "loadShaderSourceFromFile()"). Is
> there some other way? Anybody use the shader's conditional compile directives?
> Paul P.
No there's not a "compler cmdline" feature to add define flags. I
dont use the GLSL preprocessor much, tho does seem there's opportunity
to improve OSG's interface for that usemodel.
-- mew
--
Mike Weiblen -- Austin Texas USA -- http://mew.cx/
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